Skiving machine



Dec. 21 19:26;-

L. VLOVOY SKIVING MACHINE Filed August 17; 1925 2 Sheets-Sheet l LouvsLovov Patented Dec. 21, 1926.

UNETED STATES LOUIS LOVOY, OF BIRIVIINGHAM, ALABAMA.

SKIVING MACHINE.

Application filed August 17, 1925. Serial No. 50,861.

My invention relates to a skiving machine for converting the cord and fabric bodies of old tire casings into boots, reliners and the like.

The object of my invention is to provide a comparatively simple and inexpensive machine which will skive a fabric or cord body to a feather edge regardless of variations in the thickness of the casing bodies. and to this end the skiving knife is rotatably mounted on a tilting frame which moves responsive to the relative movement between the feed rollers so that it will always lie in a diagonal plane bisecting the space between the rollers, which space will of course vary with the thickness of the body being worked.

My invention also comprises the novel details of construction and operation which will be. more clearly understood by reference to the following specification and to theaccompanying drawings, in which:-

Fig. 1 is a plan view; and

Fig. 2 an end elevation of my improved .skiving machine.

Figs. 3, 4, and 6 are sectional views taken on the lines 3-8, 4-4, 5 5 and 6-(5, respectively7 of Fig. 1. l

Figs. 7 and 8 are diagrammatic views illustrating the automatic adjustment of the skiving knife responsive to the different thicknesses of material to be skived.

Fig. 9 is a view corresponding to Figs. 7 and 8 illustrating' a modification in the feed rolls which are concave to enable the rotating knife to be set closer.

Similar reference numerals refer to similar parts throughout the drawings.

1n the embodiment of my invention illustratcd, I mount upon a base l a vertical standard 2 which is provided in its upper end with a bearing for the shaft 3 having fast on one overhung end a grooved feed roller 4 and on the other end a sprocket gear 5 which meshes a smaller gear 6 fast upon a stud shaft 7 rotatably mounted in a bear-Y ing 8 bored in one end of the standard 2. A set screw 9 is inserted through the standard 2 and engaged in a circumferential groove 10 formed near the inner end of the shaft 7 and acting to hold the shaft in position in its bearing. A pulley 11 is mounted on the shaft 7 beyond the gear 6 and tins pulley is driven by hand or by a belt (not shown) from any suitable source of power.

A lower feed roll 12 is rotatably mounted on a stud shaft 13 fast in the upper end of a vertically adjustable bearing bracket 14. This bracket has a bottom cylindrical shank 15 that is slidable through a lug or ear 16 on the standard 2 and is surrounded above by a coil spring 17 which normally presses the roll 12 against the roll 4. The ear 16 carries a bottom lug 18 through which an adjusting screw 19 is threaded and adapted to engage a shoulder 20 formed by a groove 21 surrounding the lower end of the bracket shank 15. The standard has a lateral bracket 22 (see Fig. 1) which has rigid therewith a shaft-28 disposed parallel with the adjacent side wall of the standard 2 and projecting beyond an end thereof. I mount loosely on this shaft a dog 24 which is secured at one end to a bell crank lever 25 journaled to rock on the shaft 23 and carrying on its upper end a handle 26 for manual operation and having depending from its other end a rod 27 leading to a foot pedal 28. The dog engages the shoulder 29 on the opposite. side from the set screw 19 and Awhen the dog is rocked counter-clockwise the bearing bracket is depressed against the action of the spring and the rolls 4 and 'la are separated. The bracket 14 carries a lug 29 to which is pivotally connected by means of a stud screw 30 a link 31, which in turn is pivotally connected by means of a stud screw 32 to a pivotally adjustable gear housing 33 carrying the driving mechanism for the rotatable skiving knife. 34 which is mounted in a counter recess in the top of said housing so as to rotate ona shaft 35 which isrotatable in suitable bearings in the housing and has fast Vthereon within the housing a worm wheel 36 meshing a worm 87 fast on a shaft 38 which is suitably journaled in the box and carries on one overhung end a pulley 39 driven in any suitable manner. The face of the housing towards and opposite the roller 12 is hollowed at 40, while the opposite side 41 is fiat and adapted to slidably engage a thrust bearing bar 42 which is adjustably connected to vthe base 1 by a screw 43 working through an elongated slot 44 in the angled base of the bar.

The housing 33 is mounted to rock about a stud bolt 45 which has its inner end screwed into the housing and carrying an adjustable nut 46 bearing against the housing and a shoulder 47 bearing against the 4standard 2. The bolt passes loosely through an eccentric sleeve 48 (See Fig. 4) that is passed through the standard 2 and has its exposed shouldered end engaged by a nut 49 screwed on the outer threaded end of the stud bolt and adapted to jam and hold the collar against shoulder 47. The end of the stud bolt is provided with a tool grip 50 by means of which it can b-e held while either nut 46 or 49 is adjusted, the former acting to to its work in its adjusted position. A guide plate 51 is mounted on the bracket 14. The skiving knife 34 is removably mounted on the upper threaded end of the shaft 35 by means of a nut 52 having suitable Spanner wrench holes therein. The knife as mounted in its countersunk recess in the upper face of the housing 33 has but a relatively small portion of its periphery projecting without said recess opposite the approach of the work. a A

In operation, having assembled the parts in the manner shown, I turn and clamp the eccentric 48 in position to give the knife the right vertical adjustment, and by turning the nut 46 on the bolt 45 and setting the stop bar 42 I give the knife the desired horizontal adjustment. The apparatus is now ready for use. llVhen the casing is to be skived, the rubber is removed to expose the fabric or cord body and the latter is presented to the rolls 4and 12, the dog 24 being operated either by hand or foot to lower the bracket 14 and separate the rolls sutiiciently for the tire body to be received between them. As the bearing bracket 14 carrying the lower roll is depressed it pulls down the link 81 and with it rocks the housing 33 carrying the skiving knife downwardly about its supporting stud 45 as an aXis, causing the eccentric sleeve to rock in-its bearing. Then the lower roll is released and the tire body clamped between the rolls 4 and 12 the housing will rock back up and it follows, regardless of varying thickness of the tire body, that the knife will be s et always at an incline so as to diagonally bisect the clearance between the rolls `and thus to properly skive the tire body.

rthough I have described with great parneri/ivo ticularity the details of the embodiment of the invention herein shown, it is not to be construed that I am limited thereto, as changes in arrangement and substitution of equivalents may be made by those skilled in the art without deparing from the invention as defined in the appended calims.

In Fig, 9, I show modified feed rolls 4a and 12a which differ from the rolls 4 and 12 only in that their working faces are slightly concave, thereby adapting the rotary circular knife 34 to be set closer to the plane of contact between the rolls.

IIaving thus described my invention, what I claim as new and desire to secure by Letters Patent, is:-

1. In a skiving machine, feed rolls, one of which has an adjustable axis, means to operate the same, in combination with a rotatable skiving knife, a drive therefor, and a pivotal support for the knife and its drive having an operating connection adapted to move it automatically responsive to movements of said adjustable roll axis.

2. In a skiving machine, a pair of feed rolls, one having a vertically adjustable bearing, means to drive the rolls, a skiving knife having a pivotal support carrying a link connecting said support and adjustable bearing and adapted automatically to rotate the knife, and means to rock said support responsive to vertical movements of said adjustable roll bearing.

3, In a skiving machine, the combination with a pair of feed rolls having relatively adjustable parallel axes, and means to drive said rolls and adjust their axes, of a rotatable skiving knife, a worm drive for the knife, means to pivotally mount the skiving knife in position to diagonally bisect the work clearance between the rolls, and an operating connection to move the knife and its drive responsive to relative movement between the feed rolls to maintain its plane of rotation diagonally bisecting the roll clearance. v

4. In a skiving machine, a` pair of sepa rable feeding rolls, a rotating skiving knife set at an acute angle to a plane between the rolls, means to rotate the knife, means to drive the rolls, and means acting automati cally to vary said angle of the knife to said plane responsive to relative movement between the axes of the rolls.

In testimony whereof I atlix my signature.

LOUIS LOVOY. 

